A 4:7:6
B 20:35:24
C 20:35:42
D 24:35:30
Correct Answer: Option C
a:b=4:7 b:c=5:6 a:b=(4X5) : (7X5) =20:35 b:c= (5x7) : (6X7)=35:42 a:b:c= 20:35:42
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